The song “REUNION” was newly written for the stage play adaptation of the TV anime SSSS.GRIDMAN, which was scheduled to be performed in Tokyo and Osaka in May 2020.
OxT performed the TV anime’s OP theme song “UNION,” which was released as their ninth single on November 7, 2018.
The TV anime SSSS.GRIDMAN was aired for 12 episodes from October to December 2018, and is available on Crunchyroll for its members in United States, Canada, Australia, New Zealand, UK, Ireland, South Africa, and Nordics.